221211200012121 has 12 divisors (see below), whose sum is σ = 348575224261680. Its totient is φ = 134067393946680.

The previous prime is 221211200012093. The next prime is 221211200012197. The reversal of 221211200012121 is 121210002112122.

221211200012121 is a `hidden beast` number, since 221 + 211 + 20 + 0 + 0 + 1 + 212 + 1 = 666.

It is not a de Polignac number, because 221211200012121 - 2¹⁵ = 221211199979353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211200012094 and 221211200012103.

It is not an unprimeable number, because it can be changed into a prime (221211200010121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117228282791 + ... + 1117228282988.

It is an arithmetic number, because the mean of its divisors is an integer number (29047935355140).

Almost surely, 2^{221211200012121} is an apocalyptic number.

It is an amenable number.

221211200012121 is a deficient number, since it is larger than the sum of its proper divisors (127364024249559).

221211200012121 is a wasteful number, since it uses less digits than its factorization.

221211200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234456565796 (or 2234456565793 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221211200012121 its reverse (121210002112122), we get a palindrome (342421202124243).

The spelling of 221211200012121 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred million, twelve thousand, one hundred twenty-one".